GM has issued a product recall for certain examples of 2021 and 2022 Chevy LCF or Low Cab Forward 3500 and 4500 vehicles due to an issue related to the Transmission Control Module (TCM) of the GM MYD 6L90-E six-speed automatic transmission.
The problem: affected vehicles fitted with the 6.6L V8 L8T gasoline engine may have a TCM that was reprogrammed with the incorrect calibration.
The hazards: if the TCM was flashed with the wrong calibration, the transmission shift quality and timing has the potential to be degraded.
The fix: certified GM technicians will be instructed to inspect the TCM’s calibration and reprogram it if necessary.
Affected components: Transmission Control Module (TCM).
- 2021 Chevy LCF 3500/4500 with the L8T engine
- 2022 Chevy LCF 3500/4500 with the L8T engine
Number of affected vehicles: GM did not specify how many vehicles are affected by this condition.
Owners should: owners of affected vehicles will be contacted by GM with instructions on how to proceed. If owners are unsure whether or not their vehicle is affected by this recall action, they can visit my.gm.com/recalls and type in their VIN to see any open recalls that may be active on it. Affected owners can also reach out to Chevy directly using the contact information included below.
- GM recall number: N222377890
- Chevy Customer Service: 1-800-222-1020
The Chevrolet LCF (Low Cab Forward) is a series of medium duty trucks as a result of a partnership between General Motors and Isuzu Motors. The vehicles currently span two generations.
The 6.6L V8 L8T gasoline engine produces 350 horsepower and 425 pound-feet of torque in LCF 3500 and 4500 HD application.